As an important tool for modern urban transportation, the performance of electric vehicles is closely related to the matching of motors and controllers. As the two core components of electric vehicles, the reasonable matching of motors and controllers can significantly improve the power, economy, and safety of electric vehicles. Firstly, understanding the specifications and performance of the motor is the foundation of matching. Electric vehicle motors commonly use permanent magnet DC motors, which can be divided into brushed motors and brushless motors according to their electrification form, and can be further divided into two categories based on their mechanical structure: "toothed" and "toothless". These different types of motors have varying parameters such as power, torque, and speed, which determine their output capabilities and applicable scenarios. Therefore, when selecting a controller, it is necessary to match it according to the specific specifications and performance of the motor. Secondly, choosing the appropriate controller is crucial. The power of the controller should be slightly greater than that of the motor to ensure stable operation of the motor at full load. At the same time, the output voltage and current of the controller should also match the motor to avoid performance degradation due to insufficient voltage or current. In addition, modern electric vehicle controllers also have various protection functions, such as overload protection, underspeed protection, etc., which can ensure the safe operation of electric vehicles under various working conditions. During the matching process, it is also necessary to adjust the parameters of the controller according to the actual situation of the motor. For example, if the torque of the motor is large, the current setting of the controller can be appropriately increased to improve the climbing ability and acceleration performance of the electric vehicle. On the contrary, if electric vehicles are mainly used for high-speed driving, the current setting of the controller can be appropriately reduced to reduce energy consumption and extend battery life. In addition, when matching motors and controllers, economic and safety factors also need to be considered. Choosing the appropriate controller can extend the service life of electric vehicles and improve their performance. At the same time, during the matching process, it is necessary to ensure the correct connection of all connecting wires to avoid faults and safety hazards caused by wiring errors. In summary, the matching of electric vehicle motors and controllers is a complex and important process that requires comprehensive consideration based on the specifications and performance of the motors, the functions and parameters of the controllers, and actual usage needs.